If you plan on running Orion lipos just be aware they specifically recommend against the 977. Personally I run both the Ice and the Orion Advanced chargers. Advanced is cheaper and a nice, easy, small charger.

The main difference though is that the Advanced is a bit more cautious. The charge rate starts to lower before the pack gets to 8.4V where the Ice does not decrease until 8.4V exactly which seems to allow the battery to get just a bit over the 8.4 mark during the process. You get the same overall results and charge time - it just seems to treat the pack a bit gentler.